#! /bin/sh

set -e

# Check command line.
if test ! -d "$1" || test $# -lt 2; then
    cat <<EOF
$0: HTML documentation generator for Open vSwitch
usage: $0 srcdir docfile...

The VERSION environment variable should be set to the Open vSwitch version.
Must be invoked from an Open vSwitch build directory.
Most conveniently invoked via "make dist-docs".
EOF
    exit 1
fi

# Parse command line.
srcdir=$1
shift

# Check for programs we'll need.
search_path () {
    save_IFS=$IFS
    IFS=:
    for dir in $PATH; do
	IFS=$save_IFS
	if test -x "$dir/$1"; then
	    return 0
	fi
    done
    IFS=$save_IFS
    echo >&2 "$0: $1 not found in \$PATH, please install and try again"
    exit 1
}
search_path man
search_path markdown
search_path ps2pdf

# Create dist-docs directory.
distdir=dist-docs
abs_distdir=`pwd`/dist-docs
rm -rf $distdir
mkdir $distdir

# Install manpages.
make install-man mandir="$abs_distdir"/man
(cd $distdir && mv `find man -type f` . && rm -rf man)
manpages=`cd $distdir && echo *`

# Start writing index.html.
exec 3>$distdir/index.html
cat >&3 <<EOF
<html><head>
  <meta charset="UTF-8"></head>
  <link rel="stylesheet" type="text/css" href="style.css">
  <title>Open vSwitch $VERSION Documentation</title>
</head><body>
<h1>Open vSwitch $VERSION Documentation</h1>
<h2>Documents</h2>
<table>
EOF

# Add top-level documentation to index.html, giving it .txt extensions so
# that the webserver doesn't serve it as Markdown and make your web browser
# try to invoke some kind of external helper you don't have installed.
#
# Also translate documentation to HTML.
for file
do
    title=`head -1 "$srcdir/$file"`
    dir=$distdir/`dirname $file`; test -d "$dir" || mkdir "$dir"
    cp "$srcdir/$file" "$distdir/$file.txt"
    (cat <<EOF
<html><head>
  <meta charset="UTF-8"></head>
  <link rel="stylesheet" type="text/css" href="style.css">
  <title>$file (Open vSwitch $VERSION)</title>
</head><body>
EOF
     markdown "$distdir/$file.txt"
     echo "</body></html>") > "$distdir/$file.html"
    cat <<EOF
<tr>
  <td>$file</td>
  <td>$title</td>
  <td><a href="$file.html">HTML</a>, <a href="$file.txt">plain text</a></td>
</tr>
EOF
done >&3

# Add header for manpages to index.html.
cat >&3 <<EOF
</table>
<h2>Manpages</h2>
<table>
EOF

# Add manpages to index.html, translating them into PDF, HTML, and plain text.
# The HTML is just slightly marked up from the plain text version; although
# groff supports better HTML output, on my system some of the OVS manpages
# cause the groff HTML output engine to segfault (!).
(cd $distdir
 for manpage in $manpages; do
     man -l -Tps $manpage | ps2pdf - > $manpage.pdf
     GROFF_NO_SGR=1 man -l -Tutf8 $manpage | sed 's/.//g' > $manpage.txt
     (echo '<html><head><meta charset="UTF-8"></head><body><pre>'
      GROFF_NO_SGR=1 man -l -Tutf8 $manpage | sed '
s/&/&amp;/g
s/</&lt;/g
s/>/&gt;/g
s,\(.\)\1,<b>\1</b>,g
s,_\(.\),<u>\1</u>,g'
      echo '</pre></body></html>'
     ) > $manpage.html

     name=`echo $manpage | sed 's/\.\([0-9]\)$/(\1)/'`
     echo "  <tr><td>$name</td><td><a href=\"$manpage.pdf\">PDF</a>, <a href=\"$manpage.html\">HTML</a>, <a href=\"$manpage.txt\">plain text</a></td></tr>"
 done
) >&3
cat >&3 <<EOF
</table>
</body></html>
EOF

# Create CSS style file.
cat >$distdir/style.css <<'EOF'
div { vertical-align:top; }
p {
    vertical-align:baseline;
}
a {
    text-decoration: none;
    font-weight: 700;
}
a:hover {
    color:#444;
}
a:visited {
    color:#447099;
}
a:link {
    color:#447099;
}

body {
    font-family: Arial,Helvetica,sans-serif;
    font-size: 14px;
    line-height: 1.5em;
    color: #444;
    background-color:#f5f5f5;
}
EOF
